Bonn 2025 – wissenschaftliches Programm
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K: Fachverband Kurzzeit- und angewandte Laserphysik
K 3: Light and Radiation Sources I
K 3.4: Vortrag
Montag, 10. März 2025, 18:00–18:15, HS XI ITW
Towards a High Repetition-Rate, High Power, High Harmonic Generation Setup for Time-resolved Molecular Spectroscopy — •Lorenzo Pratolli1,3, Katinka Horn1,2, Vincent Wanie1, Terry Mullins1, Luca Poletto4, Fabio Frassetto4, and Francesca Calegari1 — 1Center for Free-Electron Laser Science, Hamburg, Germany — 2ETH Zürich, Zürich, Switzerland — 3HELIOS, Hamburg, Germany — 4Universita di Padova, Padova, Italy
High-Harmonic Generation (HHG) is a process that allows to generate extreme ultraviolet (XUV) light pulses with attosecond duration through intense optical fields and has been widely employed for ultrafast time-resolved molecular spectroscopy. Scaling the collection statistics is a challenge to which Yb fibre lasers provide a convenient solution thanks to their high repetition-rate operation. Multi-Pass Cells (MPCs) have emerged as an appealing solution to address the primary issue of these systems, their relatively long pulse duration. These cells can compress pulses from several hundred femtoseconds to durations below 20 femtoseconds, while maintaining over 90% efficiency, a compact setup, and excellent beam quality. Here we present the development of a setup for HHG at high repetition-rates driven by compressed pulses from an MPC, which can also be used for ultrafast UV generation. The setup will carry out pump-probe measurements of biomolecules in water clusters, using XUV-near infrared (NIR) interaction. The setup features also a time-compensating monochromator, with possibility to switch between monochromatic and broadband operation dynamically.
Keywords: High harmonic generation; High repetition rate lasers; ultrafast spectroscopy